A novel fluorescent μ-O bridged dinuclear Ni(II) coordination polymer with 4,4′-oxybis(benzoic acid) and its photocatalysis activity

A novel Ni(II) coordination polymer with flexible 4,4′-oxybis(benzoic acid) (oba) and rigid 4,4′-bipyridine was prepared hydrothermally and crystallographically characterized. It shows an unusual μ-oxo(O2−) bridged dinickel(II) polymer. In the dimetal core, each metal center is six-coordinated to three carboxylate oxygen atoms from two different oba ligands, two nitrogen atoms of distinct 4,4′-bipyridine and one bridging oxygen forming a distorted octahedron.Upon complexation, nickel complex exhibits intense purple fluorescence (413.8 nm) which may originates to the O2−Ni2+(LMCT) in addition to the peaks of intraligand π–π∗ transition of oba ligand (317.7 and 720.7 nm). Moreover, nickel crystals possess preferable photocatalytic decomposition of RhB solution.

Graphical abstractA novel Ni(II) coordination polymer with flexible 4,4′-oxybis(benzoic acid) and 4,4′-bipyridine was prepared hydrothermally and crystallographically characterized. It shows an unusual μ-oxo(O2−) bridged dinickel(II) polymer where each metal center is six-coordinated to three carboxylate oxygen atoms, two nitrogen atoms and one bridging oxygen forming a distorted octahedron. Incorporation of Ni ions and 4,4′-oxybis(benzoic acid) into polymer generate intense purple fluorescence and possess preferable photocatalytic decomposition of RhB solution.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Novel Ni(II) coordination polymer with 4,4′-oxybis(benzoic acid) and 4,4′-bipyridine was prepared. ► It shows an unusual μ-oxo(O2−) bridged dinickel(II) center. ► Nickel complex exhibits intense purple fluorescence (413.8 nm) which may originates to the O2−Ni2+(LMCT). ► Nickel crystals possess preferable photocatalytic decomposition of RhB solution.